package com.qiandao.xuexitong.exception;

import com.qiandao.xuexitong.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.validation.BindException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import javax.validation.ConstraintViolationException;

/**
 * 全局异常处理器
 */
@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {
    
    /**
     * 处理业务异常
     */
    @ExceptionHandler(BusinessException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<Void> handleBusinessException(BusinessException e) {
        log.error("业务异常: {}", e.getMessage());
        return Result.error(e.getCode(), e.getMessage());
    }
    
    /**
     * 处理参数校验异常
     */
    @ExceptionHandler({MethodArgumentNotValidException.class, BindException.class})
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<Void> handleValidException(Exception e) {
        String message = "参数校验失败";
        if (e instanceof MethodArgumentNotValidException) {
            message = ((MethodArgumentNotValidException) e).getBindingResult().getFieldError().getDefaultMessage();
        } else if (e instanceof BindException) {
            message = ((BindException) e).getBindingResult().getFieldError().getDefaultMessage();
        }
        log.error("参数校验异常: {}", message);
        return Result.error(400, message);
    }
    
    /**
     * 处理约束违反异常
     */
    @ExceptionHandler(ConstraintViolationException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<Void> handleConstraintViolationException(ConstraintViolationException e) {
        log.error("约束违反异常: {}", e.getMessage());
        return Result.error(400, e.getMessage());
    }
    
    /**
     * 处理其他异常
     */
    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public Result<Void> handleException(Exception e) {
        log.error("系统异常: ", e);
        return Result.error(500, "系统异常,请联系管理员");
    }
} 